Cry about...
Exchange Troubleshooting

---

#550 5.2.3. RESOLVER.RST.SendSizeLimit.Org; message too large for this organization

---

Symptom:

When someone tries to send email to your exchange server the email delivery fails with the message:

user@yourdomain.com
#550 5.2.3 RESOLVER.RST.SendSizeLimit.Org; message too large for this organization ##

where "user@yourdomain.com" is the email address of the recipient on your exchange server.

Cause:

The are three limits in Exchange which are applicable when receiving emails:

1. The limit on the connector, this is the maximum message size for an email when it is received by Exchange.
2. The limit on the internal transport, this is the maximum message size that Exchange will attempt to move to an inbox. 
3. The limit on the individual inbox (if any).

The error indicates "message too large for this organisation" that it is the internal transport limit which is too low.

Remedy:

• If you are receiving this error in response to an email you are attempting to send then you will need to either:
  1. Contact the administrator responsible for the destination server (or ask the message recipient to do so) to get the issue resolved. Or
  2. Reduce the size of your email - possibly zipping any attachments or splitting any attachments across two or more emails.

• If you are the administrator for the receiving server then on the server hosting Exchange:

  1. Start Exchange Management Shell
  2. Get-ReceiveConnector | fl name,MaxMessageSize
     This will show you the maximum message size on each of the connectors. Check that these sizes are okay.
  3. Get-TransportConfig | fl MaxReceiveSize,MaxSendSize
     This will show you the maximum send and receive message size for the organisation transport. These should both be the same or larger than the receive connector size.
     • To increase the maximum send size on the transport connector use:
       Set-TransportConfig -MaxSendSize 20MB
       Substituting a different value for 20MB as appropriate.
     • To increase the maximum receive size on the transport connector use:
       Set-TransportConfig -MaxReceiveSize 20MB
       Substituting a different value for 20MB as appropriate.

See also: How to increase the maximum message size for incoming emails

---

These notes have been tested with Exchange Server 2010.